Question

1. the fibrous protein that makes up your hair and nails and fills your epidermal cells is called

a. carotene
b. myelin
c. keratin
d. collagen

Explanation:

To solve this, we analyze each option:

• Option A: Carotene is a pigment (e.g., in plants, for vitamin A), not a protein for hair/nails.
• Option B: Myelin insulates nerve fibers, not related to hair/nails.
• Option C: Keratin is a fibrous protein forming hair, nails, and epidermal cells.
• Option D: Collagen is for connective tissues (skin, bones), not hair/nails.

Answer:

C. Keratin